Add MultipartPayload

Author: tsuzu

go.mod

@@ -0,0 +1,3 @@
+module github.com/go-generalize/multipart-util
+
+go 1.17

multipart.go

@@ -0,0 +1,13 @@
+package multipartutil
+
+import (
+	"io"
+	"net/textproto"
+)
+
+// MultipartPayload is a payload of multipart/form-data for api_gen
+type MultipartPayload struct {
+	Filename   string
+	Data       io.Reader
+	MIMEHeader textproto.MIMEHeader
+}